Horn amplifier



March 19, 1929.

J. BERG HORN AMPLIFIER 2 sheets-sheer- Filed Feb .jzs, i925 INVENTOR Jbgeflk B r BY WI WATTORNEY dllll March 19, 1929. J. BERG HORN AMPLIFIER File'd Feb. 25, 1925 2 Sheets-Sheet INVENTOR Joseph Berg. B x (P W? ATTORNEY Patented Mar. l9, 1929.

' UNITED STATES PATENT oFFicE.

JOSEPH BERG, OF LONG ISLAN D CITY, NEW YORK.

- HORN Amer-amen.

Application filed February 25, 1925. Serial No. 11,494.

. application to sound devices, and in some respects even need not be limited to sound devices.

One object of the invention is to provide a method of manufacture of an apparatus or device of this kind, whereby several parts of the device may be molded or stamped of papier-mach or other suitable material and then glued or otherwise secured together to form the assembled horn.

Another object of the invention is to provide an improved apparatus or device of this kind which may be manufactured by the above method.

Another object is to provide a two part convolute' sound conduit having a connecting web for connecting the parts and supporting the bell of the horn.

Another object of the invention is to provide a very compact apparatus or device of this kind which will occupy a relatively small space.

Another object is to provide a bell of ad justable efiective cross-section for modulating the t'oneof the horn.

Other objects of the invention are to improve generally the simplicity and efiiciency of such devices and their method of manufacture and to provide a device or apparatus of this kind which is durable and economical to manufacture and which will not deteriorate or get out of order.

Still other objects of the invention will apupper and lower sheet members joined'at a plane of. juncture and forming a tapering sound conduit arranged 1n a single convolution, said members also forming upper and lower webs at the side walls of the conduit and extended across said convolution and secured together to hold said members together. The larger end of said conduit is inwardly and upwardly turned between the sides of the convolution and receives thereon a hopper shaped bell forming a continuation of the large end of the conduit and resting on the webs. A movable wall movably disposed adj aeent to an outside wall of the bell and resting on and between the adjacent walls is adjustable to modulate the sound and is connected to said outside 'wall by a flexible wall adhered to said outside wall and said movable wall to form a continuous sound wall of the conduit.

In the accompanying drawing, showing by way of example, one of many possible embodiments of the invention,

Fig, 1 is a plan showing the sound amplitying horn;

Fig. 2 is an end elevation of the same;

Fig. 3 is a side elevation of the horn;

Fig. 4 is a longitudinal vertical sectional view, partly in elevation, showing the amplitying horn; L

Fig. 5 is a transverse vertical sectional view, taken on the line 5-5 of Fig. 4c, looking in the direction of the arrow of said line; and

Fig. 6 is a transverse vertical sectional view, partly in elevation, showing the inner supporting webs and the bell thereon, saidsection being taken on the line 66 of Fig. 4, lookingin the direction of the arrow of said ine.

Upper and lower horn forming sheet members 10 and 11 (Fig. 3) of stamped, pressed molded papier-mach or other plastic or suitable material, or plastic-coated fabric are,

glued or otherwise joined at a single horizontal plane of juncture approximately symmetrical thereto and forming upper and lower walls 13 and 14 (Fig. 4) of a sound amplifying conduit 15 of round gradually lncreasing cross section, and arranged in a single convolution of elongated approximate:

ly'rectangular shape as shown by Fig. 1. I

Said members form upper and lower outer and inner webs 16', 17, 18 and 19 contacting each other at said plane of parting and joining onto the outer and inner sides of the walls 13 and 14 of said conduit, whereby said sheet members may be securely secured together. The said outer webs 16 and 17 are narrow, as shown, but the inner-webs 18 and 19 are extended in contact with each other across. the

convolution to form at said plane of juncture supporting webs for the bell later to be described. v

The larger end of said conduit is inwardly turned .between the longer sides of the convolution and has its upper wall 26 terminating in a rearwardly inclined edge face 27 joining the bell 20 above said plane of juncture. The lower wall 28 of said larger end is extended as at 29 a distance beyond said edge face 27 and is upwardly inclined as at 30 and merged into said lower inner web 19 and cooperates with said inclined face 27 to form a large outlet for the sound conduit, both inner webs 18 and 19 being discontinued at said large outlet. The amplifying bell 20 having the shape of .an inverted truncated pyramid, or hopper-shaped, has an outside end wall recessed or cut away as at 36 at its lower part and suitably seeured to said inclined face 27. The other walls 37, 38 having a lateral lower edge flange '39 resting on and secured to said upper supporting web 18, whereby said bell forms a continuation of the large end of the conduit.

A false or movable wall 40. movably disposed adjacent to said outside wall 35 and resting on and between felt linings 41, Fig. 1 adhered to the side walls 37 of said hopper near the said outside wall 35, to form asubstantially sound tight joint is provided at its lower part with an arched cutaway portion 42 approximately registeringrwith the cutaway portion 36 of said outside wall. An arch shaped accordion plait-ed flexible wall 43 suitably adhered to said outside wall 35 and said movable wall 40 over said cutaway portion forms. a continuous sound wall between said outside wall 26 and said movable wall 40 in anyposition of the movable wall.

A push rod 45 passing through a washer 46 on the wall 35 is provided with a manipulating button 47 at the outer end, and with a ball 48 on the inner end disposed in a recess 49 in thebaek face of a block 50 secured on said movable wall having a slot-51 communieating with the recess for receiving the rod resulting sound.

economical and eflicient.

45, whereby manipulation of said button and rod may cause said movable wall to move near to or further from said short wall, therebyto decrease or increase the effective flare of the bell, thus to decrease or increase the The method of making the horns is very The upper and lower. horn forming sheet members 10 and 11 are first pressed outior otherwise formed of plastic or other suitable material in a form to constitute upper and lower walls 13 and 14: respectively of the convolute sound ampli fying conduit 15, as shown, the inner webs being extended across said convolution exone upon the other for forming the conduit.

Next the bell 20, which may be pressed out, molded orotherwise constructed, is glued to the face 27 and at its flange 89 to the web 18.

.how far the movable wall is thus moved.

I claim as my invention:

1. In combination, sound amplifying conduit of round gradually increasing cross section arranged in a single convolution ofv elongated approximately rectangular shape; the larger end of said conduit being inwardly turned between the longer sides of the convolution and having its upper wall terminating in a rearwardly inclined edge face and its lower wall of said larger end being extended a distance beyond said edge face and upwardly inclined and having a horizontal face cooperating with said inclined face to form a large outlet for the sound conduit; and a vertically disposed hopper-shaped bell disposed on the outlet of said conduit and joined to said faces. 2. In combination, sheet members joined at a plane of parting and forming walls and a tapering soundv conduit arranged in a convolution; said members forming upper and lower webs extended across said convolution; and a bell disposed on the outlet end of said conduit and resting on said webs.

3. In combination, sheet members joined at a plane of parting and forming walls and a sound conduit arranged in a single convolution; said members forming upper and lower webs extended across said convolution; the larger end of said conduit being inwardly and u wardly turne'd between the sides of the convo ution; and a bell forming a continuation of the large end of the conduit and restin g on said webs.

l. In combination, sheet members joined at a plane of juncture and forming walls and a tapering sound conduit arranged in a single convolution; said members forming outer and inner, upper and lower webs joining the sides of the conduit; the inner webs being extended in contact across said convolution to form supporting webs at said plane of juncture; the larger end of said conduit being inwardly turned between the longer sides of the convolution and having its 11 per wall terminating in a rearwardly inclined edge face above said plane of juncture; the lower wall of said larger end being extended a distanee beyond said edge and upwardly inclined and merged into said lower inner web and cooperating with said inclined face to form a large outlet for'the sound conduit,

both inner webs being discontinued at said large outlet; and a hopper shaped amplifying bell having an outside end wall cut away at the lower part and secured to said inclined face, the other walls having a lateral lower edge flange resting on said upper supporting web, whereby said bell forms a continuation of the large end of the conduit.

5. In combination, a sound conduit, a bell on the end of the conduit; a movable wall movably disposed adjacent to an outside wall of the bell resting on and between the adjacent walls; and a flexible wall adhered to said outside wall and said movable wall to form a continuous sound wall.

6. In combination, asound conduit; a hopper shaped bell forming a continuation of the conduit; a movable wall movably disposed adjacent to an outside wall of the bell and resting on and between the adjacent walls; a flexible wall adhered to said outside wall and said movable wall to form a continuous sound walll; and means to manipulate said movable wal 7. In combination, a sound conduit; a bell formed with a cut-away outer wall joined on said conduit; a movable wall disposed in said bell and-movable to and away from the outer wall and having a cut-away portion registerable with thecut-away portion of said outer wall; and an arch shaped accordion plait- I ed flexible wall adhered to said cut-away wall and said movable wall over said cut away portions to form a continuous sound conduit.

8. In combination, a sound conduit; a bell formed on said conduit; linings of soft material on opposite walls of said bell; and a movable walldisposed in said bell and movable to and awayfrom an-outer wall thereof between said; linings,

V 9. In combination, a sound conduit having an upturned outlet end; a hopper shaped amplifying bell having an outside end wall cutaway at the lower part'and secured to said end, the other walls having a lower edge joined to said end, whereby said bell forms a continuation of the large end of the conduit; felt linings adhered to the side walls of said hopper near the said outside wall; a false or movable wall movably disposed adjacent to said outside wall and resting on and between the felt lin ings to form a substantially sound tight joint and provided with an arched cut-away portion at its lower part approximately regis tering with the cut-away portion of said outside wall; and an arch shaped accordion plaited flexible'wall adhered. to said outside wall and said movable wall over said cutaway portions to form a continuous sound wall between said outside wall and said movable wall in any. position of the false wall.

10. In combination, a sound conduit; a hopper shaped bell forming a continuation of the lar e end of the conduit; a movable Wall movab y disposed adjacent to an outside wall of the bell and resting on and between the adjacent walls; a flexible wall adhered to said outside wall and said movable wall to form a continuous sound wall; a perforated Washer on the inner face of said outside wall; a push rod passing through said washer and wall and provided with a manipulating button at the outerv end and a ball on the inner end; a block secured on said movable wall and having a recess in its back face receiving said ball and a slot communicating with the recess and receiving the rod; whereby manipulation of said button and rod may cause said movable wall to move near to or further from said short wall thereby to decrease or increase the effective fiare'of the bell and the resulting sound.

11. In'combination, upper and lower horn forming sheet members approximately symmetrical and joined at a single plane of juncture forming upper and lower walls of a single sound amplifying conduit of round gradually increasing cross-section arranged in a convolution; said members forming outer and inner webs on the walls of the conduit at said plane of juncture, the webs of one sheet member contacting and joining webs of the other sheet member whereby said sheet members are secured together; said inner webs extending continuously across the convolution except at the interior of the conduit.

1-2. In combination, sheet members disposed substantially symmetrical to, and joined at, a plane of junctureand forming walls of a single sound conduit having its outlet end turned transverse to said plane and a bell forming a continuation of said outlet end and disposed axially transverse to said plane.

18.In combination, sheet members disposed substantially symmetrical to, and

joined at, a plane of juncture and forming walls of a sound conduit of increasing crosssection arranged in a convolution; the larger end portion of said conduit being inwardly turned between the sides of the convolution and having its outlet end turned in a direction transverse to said plane; and a bell forming a continuation of said outlet end and disposed axially transverse to said plane.

14:. In combination, sheet members disposed substantially symmetrical to, and joined at, a plane of juncture and forming walls of a sound conduit; one wall of the out let end portion of saidconduit being extended beyond the edge of the other-wall and turned to said plane; and a bell forming a continuation of said end portion and joining said edges and disposed axially transverse to said plane.

15. In combination, sound amplifying conduit of increasing cross section the larger end portion of said conduit having one wall terminating in a backwardly inclined edge and the opposite wall inclined and extended a distance beyond said edge and formed with a face disposed in a plane longitudinal to said portion and cooperating with said edge to form a large outlet for the sound conduit; and a bell disposed on the outlet end of said conduit and joined to said edge and face.

16. In combination, sound amplifying conduit of increasing cross section arranged in a convolution of approximately rectangular shape; the larger end of said conduit being inwardly turned between opposite sides of the convolution and having one wall terminating in an edge and the opposite wall inclined and extended a distance beyond said edge and formed with a face cooperating with said edge to form a large outlet for the sound conduit; and a bell disposed on the outlet end pf said conduit and joined to said edge and ace.

17. In combination, sound amplifying conduit of increasing cross section arranged in one plane in a convolution of approximately ellipse shape; the larger end of said conduit being in said plane and inwardly turned be-' tween opposite sides of the convolution and having its outlet end turned to and transverse to said plane; and a bell disposed on the outlet end of said conduit axially transverse to said plane.

18. In combination, a bell; and a movable wall movably disposed adjacent to an outside wall of the bell between the adjacent Walls and extending to the mouth of the bell.

19. In combination, a bell having a fixed wall; and a movable wall movably disposed .opposite to said fixed wall between the adrod having sliding connection with the movable wall and guided for straight line movement through the outer wall.

Signed at New York, in the county of New York and State of New York, this 24th day of February, A. D. 1925.

JOSEPH BERG. 

